This might feel counterintuitive against a big power server but you should move forwards into every return of serve. Having the body weight behind the return acts like a wall. You will also improve your accuracy and consistency with this technique.
From the split-step move into the court and cut the angle of the ball off. If you struggle doing this move back a step and give yourself an extra half metre. This should give you the time. Especially playing against big servers, you want to feel almost like you’re throwing your body at the ball.
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